After a car crash, David Li and Reese Holloway learn the truth: they’ve been “adapted” with alien DNA. Malinda Lo says she had The X-Files in mind when she wrote these linked YA novels, but what makes them truly stand out is her handling of the love triangle, in which Reese struggles to choose between David and her alien ex-girlfriend. I’m including Adaptation and Inheritance for David’s sake; for YA fantasy about Asian girls in love, consider Lo’s previous book, Huntress.